Double-helix high-performance multifunctional hydrogel fiber for health detection and preparation method of double-helix high-performance multifunctional hydrogel fiber

Abstract

The invention discloses a double-helix high-performance multifunctional hydrogel fiber for health detection and a preparation method of the double-helix high-performance multifunctional hydrogel fiber, and relates to the technical field of hydrogel fibers. When the double-helix high-performance multifunctional hydrogel fiber for health detection is prepared, AgNWs / PEDOT: PSS hydrogel is subjected to wet spinning, and the AgNWs / PEDOT: PSS hydrogel fiber is prepared; the CNTs / PEDOT: PSS hydrogel is subjected to wet spinning, and CNTs / PEDOT: PSS hydrogel fibers are prepared; the AgNWs / PEDOT: PSS hydrogel fiber and the CNTs / PEDOT: PSS hydrogel fiber are wound, and the double-helix high-performance multifunctional hydrogel fiber for health detection is prepared. The double-helix high-performance multifunctional hydrogel fiber for health detection prepared by the invention has excellent response rate, reliability and electromagnetic shielding performance.

Description

Technical Field

[0001] This invention relates to the field of hydrogel fiber technology, specifically to a double-helix high-performance multifunctional hydrogel fiber for health monitoring and its preparation method. Background Technology

[0002] Flexible fiber sensors are a new type of sensor device that uses fiber materials as functional carriers and is constructed through composite conductive nanomaterials, conductive polymers, and other active components. Due to their excellent flexibility, weavability, and environmental adaptability, they have shown great potential in wearable health monitoring and smart healthcare. Resistive strain sensors based on sodium polyacrylate and incorporating the conductive polymer PEDOT:PSS have become one of the mainstream technologies in this field due to their good tensile strength and biocompatibility. However, the sensitivity and response speed of these devices based on a single sensing mechanism are often difficult to balance, making it difficult to achieve high accuracy and rapid response when monitoring subtle and rapid physiological activities (such as electrocardiogram signals) or human movement, thus limiting the accuracy and real-time performance of the monitoring data. Secondly, a single resistance signal is highly susceptible to environmental electromagnetic interference, exhibiting poor stability and low signal-to-noise ratio in various complex usage scenarios, seriously affecting the reliability of the device. With the increasing electromagnetic pollution caused by the density of electronic devices, the development of flexible devices with electromagnetic shielding functions, especially for protecting sensitive groups such as children and pregnant women, is urgently needed. However, the existing research methods for constructing three-dimensional conductive networks using one-dimensional nanomaterials such as silver nanowires and carbon nanotubes to prepare flexible shielding materials are mostly independent of sensor development, resulting in limited functionality.

[0003] Therefore, developing a flexible fiber sensor that is simple in structure, easy to fabricate, and can efficiently integrate multiple functions such as highly sensitive strain sensing, effective triboelectric sensing, and excellent electromagnetic shielding into a single device has broad application value and market prospects. Summary of the Invention

[0004] The purpose of this invention is to provide a double-helix high-performance multifunctional hydrogel fiber for health detection and its preparation method, so as to solve the problems existing in the prior art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following solution: A double-helix high-performance multifunctional hydrogel fiber for health detection is prepared by wet spinning AgNWs / PEDOT:PSS hydrogel fiber; wet spinning CNTs / PEDOT:PSS hydrogel fiber; and winding AgNWs / PEDOT:PSS hydrogel fiber and CNTs / PEDOT:PSS hydrogel fiber together. The AgNWs / PEDOT:PSS hydrogel is prepared by mixing an aqueous solution, a silver nanowire solution, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate. The aqueous solution was prepared by adjusting the pH of deionized water with a standard hydrochloric acid solution. The CNTs / PEDOT:PSS hydrogel is prepared by mixing an aqueous solution, a carbon nanotube dispersion, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate. The carbon nanotube dispersion is prepared by ultrasonically dispersing carbon nanotubes and deionized water.

[0006] A method for preparing a double-helix high-performance multifunctional hydrogel fiber for health detection, the method comprising the following preparation steps: (1) The AgNWs / PEDOT:PSS hydrogel was placed in a wet spinning machine and wet spun at an extrusion speed of 75~85mL / h. It was then solidified in a methanol bath to obtain AgNWs / PEDOT:PSS hydrogel fiber. (2) Place the CNTs / PEDOT:PSS hydrogel in a wet spinning machine and wet spin it at an extrusion speed of 75~85mL / h. Then solidify it in a methanol bath to obtain CNTs / PEDOT:PSS hydrogel fiber. (3) By winding AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers, a double-helix high-performance multifunctional hydrogel fiber for health detection is obtained.

[0007] As an optimization, the preparation steps of the AgNWs / PEDOT:PSS hydrogel in step (1) are as follows: the aqueous solution, silver nanowire solution, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) are mixed evenly at a volume ratio of 1:(0.9~1.1):(0.45~0.55), stirred at room temperature for 5~15 min, glycerol of 0.15~0.25 times the total solution mass is added, stirring is continued for 3~7 min, sodium polyacrylate of 0.13~0.15 times the aqueous solution mass is added, the temperature is raised to 75~85℃, the reaction is stirred for 3.5~4.5 h, and centrifuged for 20~40 min to obtain the AgNWs / PEDOT:PSS hydrogel.

[0008] As an optimization, the preparation steps of the aqueous solution are as follows: deionized water is micro-titrated to pH=5.06~5.08 using 0.05mol / L hydrochloric acid standard solution as titrant to obtain an aqueous solution.

[0009] As an optimization, the silver nanowire solution is of model ZKKY-Ags-50-S-2, purchased from Beijing Zhongke Keyou Technology Co., Ltd.

[0010] As an optimization, the preparation steps of the CNTs / PEDOT:PSS hydrogel in step (2) are as follows: the aqueous solution, carbon nanotube dispersion, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) are mixed evenly at a volume ratio of 1:(0.3~0.36):(0.3~0.36), stirred at room temperature for 5~15 min, glycerol of 0.15~0.25 times the total solution mass is added, stirring is continued for 3~7 min, sodium polyacrylate of 0.09~0.096 times the aqueous solution mass is added, the temperature is raised to 75~85℃, the reaction is stirred for 3.5~4.5 h, and centrifuged for 20~40 min to obtain the CNTs / PEDOT:PSS hydrogel.

[0011] As an optimization, the preparation steps of the carbon nanotube dispersion are as follows: carbon nanotubes and deionized water are mixed evenly at a mass ratio of 1:(9900~10100), and ultrasonically dispersed at room temperature for 15~25 min to obtain the carbon nanotube dispersion.

[0012] As an optimization, the carbon nanotubes are 20 μm in length and 10 nm in diameter, and were purchased from Jiaxing Nanomaterials Co., Ltd.

[0013] Compared with the prior art, the beneficial effects achieved by the present invention are: In preparing high-performance, multifunctional double-helix hydrogel fibers for health testing, this invention involves adjusting the pH of deionized water with a standard hydrochloric acid solution to obtain an aqueous solution; mixing the aqueous solution, silver nanowire solution, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate to obtain AgNWs / PEDOT:PSS hydrogel; wet spinning the AgNWs / PEDOT:PSS hydrogel to obtain AgNWs / PEDOT:PSS hydrogel fibers; and ultrasonically dispersing carbon nanotubes and deionized water to obtain carbon nanotubes. A CNTs / PEDOT:PSS hydrogel was prepared by mixing an aqueous solution, a carbon nanotube dispersion, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate. The CNTs / PEDOT:PSS hydrogel was then wet-spun to obtain CNTs / PEDOT:PSS hydrogel fibers. Finally, AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers were wound together to obtain a double-helix high-performance multifunctional hydrogel fiber for health monitoring.

[0014] First, the pH of deionized water was adjusted with a standard hydrochloric acid solution to prepare an aqueous solution. Then, the aqueous solution, silver nanowire solution, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate were mixed to prepare AgNWs / PEDOT:PSS hydrogel. AgNWs / PEDOT:PSS hydrogel was then wet-spun to obtain AgNWs / PEDOT:PSS hydrogel fibers. Silver nanowires, due to their high aspect ratio, construct continuous, highly conductive pathways within the poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) matrix. Their intrinsic high conductivity imparts extremely low charge transport resistance to the pathways. When the sensor is subjected to human movement... When subjected to stretching, bending, or other deformations caused by movement, the pitch of the double helix structure changes instantaneously, leading to a reversible "contact-separation" dynamic reconstruction of the silver nanowire conductive network. This, in turn, rapidly triggers a sudden change in the overall resistance. When the fiber is subjected to stretching, bending, or other deformations caused by human movement, the pitch of the helical winding structure increases, the contact area between fibers decreases, and the resistance of the conductive path rises. When the fiber relaxes, the pitch recovers, and the resistance falls back. This direct correlation between "structural deformation and resistance response" eliminates the need for a complex charge relaxation process, enabling a millisecond-level rapid response to physiological signals. This endows the double helix high-performance multifunctional hydrogel fiber used for health monitoring with an excellent response rate.

[0015] Secondly, carbon nanotubes and deionized water were ultrasonically dispersed to prepare a carbon nanotube dispersion. An aqueous solution, the carbon nanotube dispersion, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate were mixed to prepare a CNTs / PEDOT:PSS hydrogel. The CNTs / PEDOT:PSS hydrogel was then wet-spun to obtain CNTs / PEDOT:PSS hydrogel fibers. The carbon nanotubes within the CNTs / PEDOT:PSS hydrogel fibers intertwine to form a three-dimensional network that combines rigidity and toughness. This network exhibits excellent fatigue resistance and is not prone to breakage or collapse during long-term cyclic deformation, thus maintaining the integrity of the conductive pathways and providing a structural safety net for stable sensor signal output. This ensures long-term cyclic stability, thereby endowing the double-helix high-performance multifunctional hydrogel fiber used for health monitoring with excellent reliability.

[0016] Finally, inspired by the connection between ivy and tree branches through secreted fluids, AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers were wound together to prepare a double-helix high-performance multifunctional hydrogel fiber for health detection. The one-dimensional high aspect ratio structure of silver nanowires forms a metallic conductive network within the fiber, which can rapidly reflect and conduct electromagnetic waves. The hollow structure and surface defects of carbon nanotubes can dissipate electromagnetic wave energy through the dielectric loss of dipole polarization on the carbon nanotube surface and the ohmic loss generated by charge transitions at the carbon nanotube-PEDOT:PSS interface. These three factors work together to form a multi-level conductive network of "reflection-conduction-loss," achieving efficient shielding of electromagnetic waves. At the same time, the PEDOT:PSS matrix, as a continuous phase, provides conjugated π-bond conductive pathways to achieve intrinsic charge transport. The helical winding topology causes electromagnetic waves to undergo multiple reflections and scatterings within the fiber. The electrical conductivity difference between PEDOT:PSS and silver nanowires / carbon nanotubes leads to the formation of a charge accumulation layer at the interface. When electromagnetic waves are incident, the accumulated charge undergoes polarization relaxation under the alternating electric field, further consuming the electromagnetic wave energy. This endows the double-helix high-performance multifunctional hydrogel fiber used for health monitoring with excellent electromagnetic shielding properties. The helical topology naturally possesses resistance to bending and tensile stress, allowing stress to be dispersed along the helical direction under load, preventing fiber breakage caused by localized stress concentration. Simultaneously, the two fibers are tightly interlocked through hydrogen bonds formed by sulfonic acid groups on the PEDOT:PSS molecular chain. This interfacial connection effectively suppresses the relative slippage and delamination of the two fibers during deformation, ensuring the continued effectiveness of the synergistic effect of the high-conductivity AgNWs network and the stable CNTs network. This avoids signal fluctuations caused by interfacial failure, thereby further improving the reliability of the double-helix high-performance multifunctional hydrogel fiber used for health monitoring. Attached Figure Description

[0017] Figure 1This is a schematic diagram of the hydrogel fiber sensor structure; where 1-liquid exudate; 2-hydrogen bond; 3-hydrogen bond; 4-AgNWs; 5-CNTs; Figure 2 The images show the micro / nano structure and physical model of the hydrogel fiber sensor in Example 2; where A - electron microscope image of AgNWs / PEDOT:PSS fiber; B - electron microscope image and EDS elemental distribution map of AgNWs / PEDOT:PSS fiber; C - electron microscope image of CNTs / PEDOT:PSS fiber; D - electron microscope image and EDS elemental distribution map of CNTs / PEDOT:PSS fiber; E - film of AgNWs & CNTs / PEDOT:PSS fiber bonded to objects of different materials; F - adhesion of dry and wet materials; G - schematic diagram of the load-bearing capacity of AgNWs & CNTs / PEDOT:PSS fiber film. Figure 3 The sensing performance of the hydrogel fiber sensor is tested; A - sensitivity curve of the sensor in Example 2; B - response time of the sensor in Example 2; C - step test of the sensor in Example 2; D: comparison of sensitivity curves of Example 2 and Comparative Examples 1-2; E - stability test of the sensor in Example 2. Figure 4 The electrocardiogram (ECG) performance of the hydrogel fiber sensor in Example 2 is as follows: A - Comparison of multiple heartbeat waveforms recorded by the hydrogel electrode of Example 2 and a commercial electrode; B - Comparison of a single heartbeat waveform recorded by the hydrogel electrode of Example 2 and a commercial electrode; C - ECG waveforms monitored by the hydrogel electrode of Example 2 under exercise and resting conditions; D - ECG waveforms detected and recorded by the hydrogel electrode of Example 2 and the commercial electrode under different conditions (bending, compression, and stretching); E - Noise ratio of the hydrogel electrode of Example 2 and the commercial electrode under bending, compression, and stretching conditions. Figure 5 Passive cooling testing and characterization of electronic skin; wherein A - the total electromagnetic shielding efficiency of Example 2 and Comparative Examples 1-2 in the X-band; B - the reflection loss, absorption loss and shielding efficiency of the fibers of Example 2 and Comparative Examples 1-2; C - the absorption coefficient, reflection coefficient and transmission coefficient of the fibers of Example 2 and Comparative Examples 1-2; D - the electromagnetic shielding effect of the hydrogel film prepared by the fibers of Example 2 and Comparative Examples 1-2 on Bluetooth headsets. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] Example 1: A method for preparing a double-helix high-performance multifunctional hydrogel fiber for health detection, the method comprising the following steps: (1) Use 0.05 mol / L hydrochloric acid standard solution as titrant to titrate deionized water to pH=5.06 to obtain an aqueous solution; mix the aqueous solution, silver nanowire solution, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) at a volume ratio of 1:0.9:0.45, stir at room temperature for 15 min, add 0.15 times the total solution mass of glycerol, continue stirring for 7 min, add 0.13 times the aqueous solution mass of sodium polyacrylate, heat to 75℃, stir for 4.5 h, centrifuge for 40 min to obtain AgNWs / PEDOT:PSS hydrogel; place AgNWs / PEDOT:PSS hydrogel in a wet spinning machine, wet spin at an extrusion speed of 75 mL / h, solidify in a methanol bath to obtain AgNWs / PEDOT:PSS hydrogel fiber; (2) Carbon nanotubes and deionized water were mixed evenly at a mass ratio of 1:9900 and ultrasonically dispersed for 25 min at room temperature to obtain a carbon nanotube dispersion. The aqueous solution, carbon nanotube dispersion, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) were mixed evenly at a volume ratio of 1:0.3:0.3 and stirred for 15 min at room temperature. Glycerol was added at 0.15 times the total solution mass, and stirring was continued for 7 min. Sodium polyacrylate was added at 0.09 times the aqueous solution mass. The temperature was raised to 75℃, and the reaction was stirred for 4.5 h. After centrifugation for 40 min, CNTs / PEDOT:PSS hydrogel was obtained. The CNTs / PEDOT:PSS hydrogel was placed in a wet spinning machine and wet spun at an extrusion speed of 75 mL / h. The fibers were solidified in a methanol bath to obtain CNTs / PEDOT:PSS hydrogel fibers. (3) By winding AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers, a double-helix high-performance multifunctional hydrogel fiber for health detection is obtained.

[0020] Example 2: A method for preparing a double-helix high-performance multifunctional hydrogel fiber for health detection, the method comprising the following steps: (1) Use 0.05 mol / L hydrochloric acid standard solution as titrant to titrate deionized water to pH=5.07 to obtain an aqueous solution; mix the aqueous solution, silver nanowire solution, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) at a volume ratio of 1:1:0.5, stir at room temperature for 10 min, add 0.2 times the total solution mass of glycerol, continue stirring for 5 min, add 0.14 times the aqueous solution mass of sodium polyacrylate, heat to 80℃, stir for 4 h, centrifuge for 30 min to obtain AgNWs / PEDOT:PSS hydrogel; place AgNWs / PEDOT:PSS hydrogel in a wet spinning machine, wet spin at an extrusion speed of 80 mL / h, solidify in a methanol bath to obtain AgNWs / PEDOT:PSS hydrogel fiber; (2) Carbon nanotubes and deionized water were mixed evenly at a mass ratio of 1:10000 and ultrasonically dispersed at room temperature for 20 min to obtain a carbon nanotube dispersion; the aqueous solution, carbon nanotube dispersion, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) were mixed evenly at a volume ratio of 1:0.33:0.33 and stirred at room temperature for 10 min. Glycerin with a mass of 0.2 times the total solution mass was added and stirred for another 5 min. Sodium polyacrylate with a mass of 0.093 times the aqueous solution mass was added, the temperature was raised to 80℃, the reaction was stirred for 4 h, and centrifuged for 30 min to obtain CNTs / PEDOT:PSS hydrogel; CNTs / PEDOT:PSS hydrogel was placed in a wet spinning machine and wet spun at an extrusion speed of 80 mL / h. It was then solidified in a methanol bath to obtain CNTs / PEDOT:PSS hydrogel fiber; (3) By winding AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers, a double-helix high-performance multifunctional hydrogel fiber for health detection is obtained.

[0021] Example 3: A method for preparing a double-helix high-performance multifunctional hydrogel fiber for health detection, the method comprising the following steps: (1) Use 0.05 mol / L hydrochloric acid standard solution as titrant to titrate deionized water to pH=5.08 to obtain an aqueous solution; mix the aqueous solution, silver nanowire solution, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) at a volume ratio of 1:1.1:0.55, stir at room temperature for 5 min, add 0.25 times the total solution mass of glycerol, continue stirring for 3 min, add 0.15 times the aqueous solution mass of sodium polyacrylate, heat to 85℃, stir for 3.5 h, centrifuge for 20 min to obtain AgNWs / PEDOT:PSS hydrogel; place AgNWs / PEDOT:PSS hydrogel in a wet spinning machine, wet spin at an extrusion speed of 85 mL / h, solidify in a methanol bath to obtain AgNWs / PEDOT:PSS hydrogel fiber; (2) Carbon nanotubes and deionized water were mixed evenly at a mass ratio of 1:10100 and ultrasonically dispersed at room temperature for 15 min to obtain a carbon nanotube dispersion. The aqueous solution, carbon nanotube dispersion and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) were mixed evenly at a volume ratio of 1:0.36:0.36 and stirred at room temperature for 5 min. Glycerin was added at a mass ratio of 0.25 times the total solution mass, and stirring was continued for 3 min. Sodium polyacrylate was added at a mass ratio of 0.096 times the aqueous solution mass. The temperature was raised to 85℃, and the reaction was stirred for 3.5 h. After centrifugation for 20 min, CNTs / PEDOT:PSS hydrogel was obtained. The CNTs / PEDOT:PSS hydrogel was placed in a wet spinning machine and wet spun at an extrusion speed of 85 mL / h. The fibers were solidified in a methanol bath to obtain CNTs / PEDOT:PSS hydrogel fibers. (3) By winding AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers, a double-helix high-performance multifunctional hydrogel fiber for health detection is obtained.

[0022] Comparative Example 1: The preparation method of the double-helix high-performance multifunctional hydrogel fiber for health detection in Comparative Example 1 differs from that in Example 2 in that steps (2) and (3) are omitted, and step (1) is changed to: using 0.05 mol / L hydrochloric acid standard solution as titrant to titrate deionized water to pH=5.07 to obtain an aqueous solution; the aqueous solution, silver nanowire solution, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) are mixed evenly at a volume ratio of 1:1:0.5, stirred at room temperature for 10 min, 0.2 times the total solution mass of glycerol is added, stirring is continued for 5 min, 0.14 times the aqueous solution mass of sodium polyacrylate is added, the temperature is raised to 80℃, the reaction is stirred for 4 h, and centrifuged for 30 min to obtain AgNWs / PEDOT:PSS hydrogel; the AgNWs / PEDOT:PSS hydrogel is placed in a wet spinning machine and wet-spun at an extrusion speed of 80 mL / h, and solidified in a methanol bath to obtain the double-helix high-performance multifunctional hydrogel fiber for health detection.

[0023] Comparative Example 2: The preparation method of the double-helix high-performance multifunctional hydrogel fiber for health detection in Comparative Example 2 differs from that in Example 2 in that steps (1) and (3) are omitted, and step (2) is changed to: mixing carbon nanotubes and deionized water at a mass ratio of 1:10000 and ultrasonically dispersing at room temperature for 20 min to obtain a carbon nanotube dispersion; mixing the aqueous solution, carbon nanotube dispersion, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) at a volume ratio of 1:0.33:0.33 and ultrasonically dispersing at room temperature for 20 min to obtain a carbon nanotube dispersion; mixing the aqueous solution, carbon nanotube dispersion, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) at a volume ratio of 1:0.33 and ultrasonically dispersing at room temperature for 20 min to obtain a carbon nanotube dispersion. Stir at room temperature for 10 min, add 0.2 times the total solution mass of glycerol, continue stirring for 5 min, add 0.093 times the aqueous solution mass of sodium polyacrylate, heat to 80℃, stir and react for 4 h, centrifuge for 30 min to obtain CNTs / PEDOT:PSS hydrogel; place CNTs / PEDOT:PSS hydrogel in a wet spinning machine, wet spin at an extrusion speed of 80 mL / h, solidify in a methanol bath to obtain double helix high-performance multifunctional hydrogel fiber for health detection.

[0024] Test Example 1 Response rate test Test method: The double-helix high-performance multifunctional hydrogel fibers used for health detection in the examples and comparative examples were fixed on a power-square flexibility tester to test the sensitivity curves. The results are shown in Table 1.

[0025] Table 1

[0026] A comparison of the experimental data from Examples 1-3 and Comparative Examples 1-2 in Table 1 reveals that the double-helix high-performance multifunctional hydrogel fiber for health detection prepared in this invention exhibits a good response rate.

[0027] By comparison, the sensitivity of Examples 1-3 was greater than that of Comparative Example 1, indicating that the pH of deionized water was adjusted using a standard hydrochloric acid solution to prepare an aqueous solution. AgNWs / PEDOT:PSS hydrogel was prepared by mixing the aqueous solution, silver nanowire solution, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate. AgNWs / PEDOT:PSS hydrogel fibers were obtained by wet spinning of the AgNWs / PEDOT:PSS hydrogel. The silver nanowires, due to their high aspect ratio, constructed a continuous, highly conductive pathway within the poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) matrix, and their intrinsic high conductivity endowed the pathway with extremely low charge transport. Resistance occurs when the sensor is subjected to stretching, bending, or other deformations caused by human movement. The pitch of the double-helix structure changes instantaneously, leading to a reversible "contact-separation" dynamic reconstruction of the silver nanowire conductive network. This rapidly triggers a sudden change in overall resistance. When the fiber is stretched or bent by human movement, the pitch of the helical winding structure increases, the contact area between fibers decreases, and the resistance of the conductive path rises. When the fiber relaxes, the pitch recovers, and the resistance falls back. This direct correlation between "structural deformation and resistance response," without the need for complex charge relaxation processes, enables millisecond-level rapid responses to physiological signals, thus endowing the double-helix high-performance multifunctional hydrogel fiber used for health monitoring with excellent response rates.

[0028] Test Example 2 Reliability testing Test method: The double-helix high-performance multifunctional hydrogel fibers used for health detection in the examples and comparative examples were connected to a signal acquisition device, and the signal-to-noise ratio under bending conditions was tested. The results are shown in Table 2.

[0029] Table 2

[0030] A comparison of the experimental data from Examples 1-3 and Comparative Examples 1-2 in Table 2 reveals that the double-helix high-performance multifunctional hydrogel fiber for health monitoring prepared in this invention has good reliability.

[0031] By comparison, the signal-to-noise ratio under bending conditions in Examples 1-3 is greater than that in Comparative Example 2, indicating that a carbon nanotube dispersion was prepared by ultrasonically dispersing carbon nanotubes and deionized water; a CNTs / PEDOT:PSS hydrogel was prepared by mixing an aqueous solution, the carbon nanotube dispersion, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate; and CNTs / PEDOT:PSS hydrogel fibers were prepared by wet spinning of the CNTs / PEDOT:PSS hydrogel fibers. The carbon nanotubes within the CNTs / PEDOT:PSS hydrogel fibers interweave to form a three-dimensional network that combines rigidity and toughness. This network has excellent fatigue resistance and is not prone to breakage or collapse during long-term cyclic deformation, thus maintaining the integrity of the conductive pathway and providing structural support for stable output of sensing signals, ensuring long-term cyclic stability. This gives the dual-screw type of fiber suitable for health monitoring a superior performance. High-performance multifunctional hydrogel fibers exhibit excellent reliability. Inspired by the connection between ivy and tree branches through secreted fluids, AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers are intertwined to create double-helix high-performance multifunctional hydrogel fibers for health detection. The helical topology naturally possesses resistance to bending and tensile stress, allowing stress to be dispersed along the helical direction under load, preventing fiber breakage caused by localized stress concentration. Simultaneously, the two fibers are tightly interlocked through hydrogen bonds formed by sulfonic acid groups on the PEDOT:PSS molecular chain. This interfacial connection effectively suppresses the relative slippage and delamination of the two fibers during deformation, ensuring the continued effectiveness of the synergistic effect of the high-conductivity AgNWs network and the stable CNTs network, avoiding signal fluctuations caused by interfacial failure, thereby further improving the reliability of double-helix high-performance multifunctional hydrogel fibers for health detection.

[0032] Test Example 3 Electromagnetic shielding performance test Test method: The double-helix high-performance multifunctional hydrogel fibers used for health testing in the examples and comparative examples were connected in parallel to form a 6cm×4cm film. The film was fixed in the center of a rectangular hollow frame, and the film was placed between the headphones and the electromagnetic radiation tester to test the electromagnetic shielding capability. The results are shown in Table 3.

[0033] Table 3

[0034] A comparison of the experimental data from Examples 1-3 and Comparative Examples 1-2 in Table 3 reveals that the double-helix high-performance multifunctional hydrogel fiber for health monitoring prepared in this invention has excellent electromagnetic shielding performance.

[0035] By comparison, the electromagnetic shielding efficiency of Examples 1-3 is greater than that of Comparative Examples 1-2, indicating that winding AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers yields a double-helix high-performance multifunctional hydrogel fiber for health detection. The one-dimensional high aspect ratio structure of silver nanowires forms a metallic conductive network within the fiber, which can rapidly reflect and conduct electromagnetic waves. The hollow structure and surface defects of carbon nanotubes can dissipate electromagnetic wave energy through the dielectric loss of dipole polarization on the carbon nanotube surface and the ohmic loss generated by charge transitions at the interface between carbon nanotubes and PEDOT:PSS. The PEDOT:PSS matrix forms a multi-level conductive network of "reflection-conduction-loss" to achieve efficient shielding of electromagnetic waves. At the same time, the PEDOT:PSS matrix, as a continuous phase, provides a conjugate π-bond conductive path to achieve intrinsic charge transport. The helical winding topology causes electromagnetic waves to undergo multiple reflections and scatterings within the fiber. Furthermore, the conductivity difference between PEDOT:PSS and silver nanowires and carbon nanotubes leads to the formation of a charge accumulation layer at the interface. When electromagnetic waves are incident, the accumulated charge undergoes polarization relaxation with the alternating electric field, further dissipating the electromagnetic wave energy. This endows the double-helix high-performance multifunctional hydrogel fiber used for health monitoring with excellent electromagnetic shielding performance.

[0036] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A double-helix high-performance multifunctional hydrogel fiber for health monitoring, characterized in that, The double-helix high-performance multifunctional hydrogel fiber for health detection is prepared by wet spinning AgNWs / PEDOT:PSS hydrogel fiber; wet spinning CNTs / PEDOT:PSS hydrogel fiber is prepared CNTs / PEDOT:PSS hydrogel fiber is prepared CNTs / PEDOT:PSS hydrogel fiber is prepared by winding AgNWs / PEDOT:PSS hydrogel fiber and CNTs / PEDOT:PSS hydrogel fiber. The AgNWs / PEDOT:PSS hydrogel is prepared by mixing an aqueous solution, a silver nanowire solution, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate. The aqueous solution was prepared by adjusting the pH of deionized water with a standard hydrochloric acid solution. The CNTs / PEDOT:PSS hydrogel is prepared by mixing an aqueous solution, a carbon nanotube dispersion, poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate), glycerol, and sodium polyacrylate. The carbon nanotube dispersion is prepared by ultrasonically dispersing carbon nanotubes and deionized water.

2. A method for preparing a double-helix high-performance multifunctional hydrogel fiber for health detection, characterized in that, The preparation method of the double-helix high-performance multifunctional hydrogel fiber for health detection includes the following preparation steps: (1) The AgNWs / PEDOT:PSS hydrogel was placed in a wet spinning machine and wet spun at an extrusion speed of 75~85mL / h. It was then solidified in a methanol bath to obtain AgNWs / PEDOT:PSS hydrogel fiber. (2) Place the CNTs / PEDOT:PSS hydrogel in a wet spinning machine and wet spin it at an extrusion speed of 75~85mL / h. Then solidify it in a methanol bath to obtain CNTs / PEDOT:PSS hydrogel fiber. (3) By winding AgNWs / PEDOT:PSS hydrogel fibers and CNTs / PEDOT:PSS hydrogel fibers, a double-helix high-performance multifunctional hydrogel fiber for health detection is obtained.

3. The method for preparing double-helix high-performance multifunctional hydrogel fibers for health detection according to claim 2, characterized in that, The preparation steps of the AgNWs / PEDOT:PSS hydrogel in step (1) are as follows: the aqueous solution, silver nanowire solution, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) are mixed evenly at a volume ratio of 1:(0.9~1.1):(0.45~0.55), stirred at room temperature for 5~15 min, glycerol of 0.15~0.25 times the total solution mass is added, stirring is continued for 3~7 min, sodium polyacrylate of 0.13~0.15 times the aqueous solution mass is added, the temperature is raised to 75~85℃, the reaction is stirred for 3.5~4.5 h, and centrifuged for 20~40 min to obtain the AgNWs / PEDOT:PSS hydrogel.

4. The method for preparing double-helix high-performance multifunctional hydrogel fibers for health detection according to claim 3, characterized in that, The aqueous solution is prepared by titrating deionized water with a 0.05 mol / L hydrochloric acid standard solution to a pH of 5.06-5.08 to obtain the aqueous solution.

5. The method for preparing double-helix high-performance multifunctional hydrogel fibers for health detection according to claim 3, characterized in that, The silver nanowire solution is of model number ZKKY-Ags-50-S-2.

6. The method for preparing double-helix high-performance multifunctional hydrogel fibers for health detection according to claim 2, characterized in that, The preparation steps of CNTs / PEDOT:PSS hydrogel in step (2) are as follows: the aqueous solution, carbon nanotube dispersion, and poly(3,4-ethylenedioxythiophene)-poly(styrene sulfonate) are mixed evenly at a volume ratio of 1:(0.3~0.36):(0.3~0.36), stirred at room temperature for 5~15 min, glycerol of 0.15~0.25 times the total solution mass is added, stirring is continued for 3~7 min, sodium polyacrylate of 0.09~0.096 times the aqueous solution mass is added, the temperature is raised to 75~85℃, the reaction is stirred for 3.5~4.5 h, and centrifuged for 20~40 min to obtain CNTs / PEDOT:PSS hydrogel.

7. The method for preparing double-helix high-performance multifunctional hydrogel fibers for health detection according to claim 5, characterized in that, The preparation steps of the carbon nanotube dispersion are as follows: carbon nanotubes and deionized water are mixed evenly at a mass ratio of 1:(9900~10100), and ultrasonically dispersed at room temperature for 15~25 min to obtain the carbon nanotube dispersion.

8. The method for preparing double-helix high-performance multifunctional hydrogel fibers for health detection according to claim 7, characterized in that, The carbon nanotubes are 20 μm long and 10 nm in diameter.

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